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<br />9n~'tOo <br /> <br />POTENTIAL FOR ONFARM IRRIGATION IMPROVEMENTS TO REDUCE SALINITY <br />LOWER GUNNISON SALINITY CONTROL STUDY, COLORADO <br /> <br />TABLE OF CONTENTS <br /> <br />Item <br /> <br />Page <br /> <br />I. Summary 1 <br />Recommendations for Implementation 5 <br /> <br />II. Introduction 6 <br />Authority for Investigation 6 <br />Purpose and Objectives 6 <br />Scope of Study 7 <br />Study Coordination 8 <br />Irrigation Management Scheduling 8 <br />Description of Plan Formulation 9 <br />Levels of System Improvements 12 <br />Levels of Improvement 12 <br />Economic Analysis 14 <br />Onfarm Benefits 14 <br />Downstream Benefits 14 <br />Other Benefits 15 <br />Principles and Standards 15 <br /> <br />III. Setting 16 <br />Location 16 <br />Physiography and Geology 16 <br />History and Archaeology 17 <br />Cl1ma te 17 <br />Water Supply 19 <br />Land Resources 19 <br />Wildlife Resources 19 <br />Social and Economic Characteristics 22 <br />Present Land and Water Uses 24 <br /> <br />IV. Problems and Needs 27 <br />Historical 27 <br />Salinity Problems in the Lower Gunnison Unit 28 <br />Salt Loading 31 <br />Erosion and Sediment 31 <br />Water Supply Management 31 <br />Water Budget Analysis 31 <br /> <br />V. Plan Formulation and the Alternative Plans 35 <br />Off-farm Lateral Improvements 38 <br />Plan Formulation 39 <br />Plan One - Continuation of Ongoing Programs 40 <br />Plan Two - Improved Irrigation Water Management - 43 <br />Minimum Level - 55,900 acres <br />Plan Three - Onfarm Ditch Lining - Minimum Level - 35,800 acres 46 <br />Plan Four - Irrigation Water Management and Onfarm Ditch 48 <br />Lining - Minimum Level - 43,800 acres <br />plan Five - Irrigation Water Management and Onfarm Ditch 50 <br />Lining - Maximum Level - 41,400 acres <br />